HarmonyOS NEXT Development Case: Simplified-Traditional Converter

[Lomanu4]

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// Import conversion library for Simplified-Traditional Chinese conversion
import { transverter, TransverterType, TransverterLanguage } from "@nutpi/chinese_transverter";
// Import clipboard service for system clipboard operations
import { pasteboard } from '@kit.BasicServicesKit';
// Import prompt service for user notifications
import { promptAction } from '@kit.ArkUI';

// Mark component as application entry point
@Entry
// Define SimplifiedTraditionalConverter component
@Component
struct SimplifiedTraditionalConverter {
// State variable for user input with watcher
@State @Watch('onInputTextChanged') inputText: string = '';
@State simplifiedResult: string = ''; // Simplified conversion result
@State traditionalResult: string = ''; // Traditional conversion result
@State isInputFocused: boolean = false; // Input field focus state
@State private themeColor: string = '#439fff'; // Primary theme color
@State private textColor: string = "#2e2e2e"; // Main text color
@State private basePadding: number = 30; // Base padding value
@State private minTextAreaHeight: number = 50; // Minimum text area height
@State private maxTextAreaHeight: number = 300; // Maximum text area height

// Handle input text changes
onInputTextChanged() {
this.simplifiedResult = transverter({
type: TransverterType.SIMPLIFIED,
str: this.inputText,
language: TransverterLanguage.ZH_CN
});

this.traditionalResult = transverter({
type: TransverterType.TRADITIONAL,
str: this.inputText,
language: TransverterLanguage.ZH_CN
});
}

// Copy text to system clipboard
private copyToClipboard(text: string): void {
const clipboardData = pasteboard.createData(pasteboard.MIMETYPE_TEXT_PLAIN, text);
const systemClipboard = pasteboard.getSystemPasteboard();
systemClipboard.setData(clipboardData);
promptAction.showToast({ message: 'Copied to clipboard' });
}

// Build UI components
build() {
Scroll() {
Column() {
// Application title
Text("Simplified-Traditional Converter")
.width('100%')
.height(54)
.fontSize(18)
.fontWeight(600)
.backgroundColor(Color.White)
.textAlign(TextAlign.Center)
.fontColor(this.textColor);

// Input section
Column() {
TextArea({ text: $$this.inputText, placeholder: 'Enter Simplified/Traditional text (mixed input supported)' })
.fontSize(18)
.placeholderColor(this.isInputFocused ? this.themeColor : Color.Gray)
.fontColor(this.isInputFocused ? this.themeColor : this.textColor)
.borderColor(this.isInputFocused ? this.themeColor : Color.Gray)
.caretColor(this.themeColor)
.onBlur(() => this.isInputFocused = false)
.onFocus(() => this.isInputFocused = true)
.borderWidth(1)
.borderRadius(10)
.backgroundColor(Color.White)
.constraintSize({ minHeight: this.minTextAreaHeight, maxHeight: this.maxTextAreaHeight });

// Clear button
Text('Clear')
.borderWidth(1)
.borderColor(this.themeColor)
.fontColor(this.themeColor)
.height(50)
.textAlign(TextAlign.Center)
.borderRadius(10)
.fontSize(18)
.width(`${650 - this.basePadding * 2}lpx`)
.margin({ top: `${this.basePadding}lpx` })
.clickEffect({ level: ClickEffectLevel.HEAVY, scale: 0.8 })
.onClick(() => this.inputText = "");
}
// ... (Other UI components follow similar pattern)
}
}
.width('100%')
.height('100%')
.backgroundColor("#f2f3f5")
.align(Alignment.Top)
.padding({ bottom: `${this.basePadding}lpx` );
}
}
Technical Implementation

1. Core Architecture

• State Management: Utilizes HarmonyOS' reactive state system with @State decorators
• Component-based Design: Implements modular UI components following HarmonyOS UI specifications
• Bidirectional Conversion: Leverages @nutpi/chinese_transverter library for text processing

2. Key Features

• Real-time text conversion with @Watch decorator
• System clipboard integration via pasteboard API
• Responsive UI with constraint-based layout
• Visual feedback mechanisms:
  • Focus state highlighting
  • Click animation effects
  • Toast notifications

3. Performance Optimization

• Dynamic text area sizing with constraintSize
• Conditional rendering for copy buttons
• Efficient state updates through reactive programming

Development Insights

1. Decorator Pattern: The @Entry and @Component decorators enable declarative component configuration
2. Service Integration: Native services like clipboard and prompt are accessed through HarmonyOS' capability APIs
3. Theme Management: Centralized color variables ensure consistent theming
4. Accessibility: Built-in copy options support both system-level and in-app operations

This implementation demonstrates HarmonyOS NEXT's capabilities in building responsive, native-quality applications with complex text processing requirements. The architecture pattern can be extended to various language processing applications while maintaining high performance standards.

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